Chevrolet Low Cab Forward 2023 Manual page 214

Warning
Do not operate the vehicle while any of
the pressure gauge needles are in the red
zone or the brake air pressure warning
light is on. Brakes are then not fully
functional, and it is dangerous to operate
the vehicle.
Brake Pedal
Free Play
Press the brake pedal with two fingers to
check that the pedal free play is proper and
the pedal moves smoothly without
abnormal interference.
Free play (measured at the tip of pedal)
10 - 18 mm (0.39 - 0.71 in)
Brake Valve Operation
Release the brake pedal after stepping on it
to check that an air release sound comes
from the exhaust hole at the brake valve
and the pedal fully returns to the released
position.
Brake Performance
Drive the vehicle slowly on a dry road and
apply the brakes. Check that the brakes are
working fully and does not pull on one side.
A brake performance check should be
performed on a wide road with good
visibility while paying adequate attention to
the traffic behind your vehicle and the
overall surroundings.
A small amount of brake squeak is normal.
Drum brakes do not have a brake lining
wear indicator to cause a squeak or squeal.
Vehicle Care
Brake Lines and Pipes
Inspection
With the steering wheel turned fully to the
left, check the left front brake line and pipe
visually and by touch, making sure that
they are free of scratches, cracks and
bulging. Also make sure that the line and
pipe do not interfere with any chassis part
or wheel, and that their joints are not
leaking and are free of any type of damage.
Check the right front brake line and pipe in
the same way. The rear left and right brake
lines and pipes should also be checked in
the same manner.
Drum Brakes
If the brake shoe linings wear out beyond
their usable limit, not only will the brake
performance be impaired, but brake
components could also fail.
Warning
Do not drive with brake shoe linings
worn out. Excessively worn brake shoe
linings may cause breakdown of brake
components and poor braking
performance and may result in a crash.
213